% Expired Patents = 20.0

EPO Patents = 1

Trademarks = 14

Forward Citations = 23

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7 inventors (with patents filed for the assignee):

Douglas A Larson (2 out of 14 patents)

Ashok S Lele (1 out of 1 patent)

Scott D Lisberg (1 out of 1 patent)

4. Thomas G Hillstrom (1 out of 1 patent)

5. Ronald H Bluestone (1 out of 5 patents)

6. Ryan J Bluestone (1 out of 2 patents)

7. Doug Larson (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 8763619 - Combination agitating parts washer and sink washer (2014-07-01),

2. 8297291 - Combination parts washer and sink washer (2012-10-30),

3. 7364663 - Filter system (2008-04-29),

4. 7300575 - Portable filter system (2007-11-27),

5. 6818126 - Filter system (2004-11-16),

Company Overview

Heritage-Crystal Clean, LLC is a leading provider of parts cleaning, waste disposal, and on-site environmental services to small and mid-sized businesses. With over 150 locations across the United States, they specialize in sustainable solutions for managing hazardous and non-hazardous waste. Their mission is to protect the environment and ensure safety through innovative, reliable, and cost-effective services.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

5 Patents

#27 in Elgin, IL

#2,422 in Illinois

#51,570 in US

Elgin, IL, United States of America

Heritage-Crystal Clean, LLC

Forward Citations = 23

7 inventors:

Douglas A Larson (2 out of 14 patents)

Ashok S Lele (1 out of 1 patent)

Scott D Lisberg (1 out of 1 patent)

4. Thomas G Hillstrom (1 out of 1 patent)

5. Ronald H Bluestone (1 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Heritage-Crystal Clean, LLC. Retrieved from https://idiyas.com/company/heritage-crystal-clean

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]

1 patent (EPO):

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]